Question

Assertion: Presence of large amounts of nutrients in water body causes excessive growth of planktonic algae.
Reason : It is due to biomagnifications
A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are flue but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false

Answer 1

Correct Answer - C
(C) Presence of large amounts of nutrients in water causes excessive growth of planktonic (free-floating) algae, called an algal bloom which imparts a distinct colour to the water bodies. Algal blooms cause deterioration of the water quality and fish mortality. Biomagnification refers to increase in concentration of the toxicantant successive trophic levels.